Metal-armor circuit-connecting attachment.



J. C. STEARNS.

METAL ARMOR CIRCUIT CONNECTING ATTACHMENT.

APPLICATION man 050.16, 1912.

LIMQAS, Patented June 29, 1915.

fizz/80.11611 T dtml'xzl 79 I Worn JASON C. STEARNS, OF WORCIESTEIR,,MASSACHUSETTS.

METAL-ARMOR CIRCUIT-CONNECTING ATTACHMENT.

Specification of Letters Patent.

Patented June 29, 1915.

Application filed December 16, 1912. Serial No. 736,899.

To all whom it may concern:

Be it known that I, JASON C. STEARNS, a citizen of the United States,residing at Worcester, in the county of lVorcester and State ofMassachusetts, have invented a new and useful Metal-ArmorCircuit-Connecting Attachment, of which the following is aspecification.

This invention relates to an electric circuit connecting attachment andthe princior more conductors and that can be attached readily to theordinary Ediswan lamp sockets that are in common use at the presenttime; to provide a construction in which the end of the metallic outercasing or shell itself engages either the electrical conductor or aninsulating collar therearound and firmly holds it in position so as toprevent rubbing, attrition and wear at this point; to provide aconstruction in which the contacting end of the cable is fixedly securedin the insulating material so that it will not be loosened or displacedby vibration and in which the insulation onthe cable is also held firmlyin a socket provided for it and in which the end of the device issuitably arranged to constitute a handle for manipulating the parts.

The invention is also designed to provide a perfect connector which canbe connected and disconnected from the lamp socket or other electricaldevice in a simple and convenient manner.

Reference is to be had to the accompanying drawing in which Figure 1 isa longitudinal central sectional view on enlarged scale of a connectingattachment constructed in accordance with this invention, and Fig. 2 isa view like Fig. 1 showing the invention applied to an armoredconductor.

The invention is shown as comprising a metal armored casing A having astraight cylindrical end a for entering the socket of an Ediswan lamp orthe like. This is provided with an enlarged portion a having a knurledsurface, preferably, to enable it to be grasped in the fingers and usedas a handle for the whole device, and provided with a contractedneck a,the purpose of which will be explained hereinafter. Within the straight.end of this attachment is secured an insulating block B formed of anydesired kind of insulating material, as hard rubber, vulcanized fiber,condensite or the like, and preferably projecting just beyond the endofthe casing A. It is provided with any desired number of longitudinalcylindrical cavities b for ends of the conductors C forming the cablewhich enter it, these cavities being arranged to receive the insulationon the end of the conductor and to hold it firmly therein, being ofsubstantially the same size as the outside insulation. Be yond thesecavities are longitudinal passages extending through to the outer flatsurface of the block B. In these passages are eye lets D of metal towhich the bare end of the conductor is soldered or otherwiseelectrically fixed so as to make a permanent electrical connection.These eyelets are flattened over on their outer and inner ends to holdthem firmly in position and they are preferably flush with the flatouter surface of the block B. Preferably, also a split insulating sleeveF ofhard rubber or other desired material is sti'ung over the cable andforced back into the end a of the metal shell A. Then this edge a iscompressed in dies and closed in upon the split insulating sleeve whenthat is.used, and directly upon the insulation of the conductor when thesleeve is not used. In either event the metal is closed in on the outerpart of the cable or tubing, rigidly holding thesame, so that there canbe no motion of the conductor at the end of the metal sleeve andconsequently no wear on the insulation. This also pre vents the entranceof water and makes the device a permanent fixture.

The insulating block B is held in the metal casing by a cross pin Gwhich projects from it on both sides, preferably, and forms a means forconnecting it with the socket of the lamp or the like.

It will be seen from what has been said that the above mentioned objectsare accomplished in a very simple and inexpensive way by the use of thisinvention and that the I parts are'all of small size and simpleconstruction; also that after once being assembl'ed they cannot readilybecome detached or disconnected from each other.

' In Fi 2 the invention is illustrated in a similar orm but applied to aconductor provided with metallic armor H. In this case the collar F canbe dispensed with and the end a is soldered or otherwise mechanicallyconnecteddirectlyto the armor H.

Although I have illustrated and described only two forms 'of theinvention, I am aware of the fact that the invention can be carried outin other ways without departing from the scope of the invention asexpressedin the clalm. Therefore, I do not wish to be limited to all thedetails of construction shown and described, but

JASON C. STEARNS.

Witnesses ALBERT E. FAY,

C. FORREST WESSON.

